Angstadt Arms

Compatible with 9mm 40 S&W 357 SIG 45acp and 10mm - Machined from 7075-T6 billet aluminum with a matte black hard-coat anodized finish - Slick side upper receiver with pistol caliber sized ejection port and no forward assist or dust cover door - Works with any mil-spec lower receiver - Upper weight: 6.5 oz